2
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 15
SV4.5CGV-
Termination
SV4.5FA or SV4.5FB
Flashing and SV4.5SC
Storm Collar
” (25.4 mm)
Minimum
Clearance to
Combustibles
u
SV4.5VF
Firestop / spacer
SV4.5L6 / 2 / 24 / 36 / 48
Vent Sections
u
When using Secure
Flex use Firestop / spacer
SF4.5VF
40 ft. Max.
(2.2 M)
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1
VENT SECTION LENGTH CHART
Nominal Section
Length (inches)
6
2
24
36
48
Net Section
Length (inches)
4 ½
0 ½
22 ½
34 ½
46 ½
Height of Vent
Number of Vent Sections
*inches
feet
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0
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5
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0
1
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5
3
1
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1
1
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5
VENT SECTION LENGTH CHART
Nominal
Section Length
(inches)
6
2
24
36
48
Net Section
Length (inches)
4 ½
0 ½
22 ½
34 ½
46
½
Height of Vent
Number of Vent Sections
*inches
feet
T
O
T
A
L
Q
T
Y
Table 9a
Table 9b
See
Figure 21 & 22
for "support strap"
requirements
* Convert inches into metric equiva-
lent measure, as follows:
Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (M) = Inches x .0254
Effective Vent Length
Model
Effective Length
SV4.5L6
4-/2"
SV4.5L2
0-/2"
SV4.5L24
22-/2"
SV4.5L36
34-/2"
SV4.5L48
46-/2"
Table 10
VERTICAL TERMINATION SYSTEMS (ROOF)
See
Figure 15
and
Figures 27
to
31
and their
associated Vertical Vent Tables illustrate the
vertical venting configurations that are allowed
to be used with these appliances. Secure Vent
pipe applications are shown in these figures;
Secure Flex pipe may also be used.
See Page
24
. A Vertical Vent Table summarizes each
system’s minimum and maximum vertical
and horizontal length values that can be used
to design and install the vent components in
a variety of applications.
Both these vertical vent systems terminate
through the roof. In the USA, the minimum
vent height above the roof and/or adjacent walls
is specified in ANSI Z223.1 (latest edition); in
Canada, by the current CAN-1 B149 installation
code. It is also specified in major building codes.
Always consult your local codes for specific
requirements. A general guide to follow is the
Gas Vent Rule (refer to
Figure 4
on
Page 5
).
Vertical (Straight) Installation
Determine the number of straight vent sec-
tions required. 4-1/2" (114 mm), 10-1/2" (267
mm), 22-1/2" (572 mm), 34-1/2" (876 mm)
and 46-1/2" (1181 mm) net section lengths
are available (see
Table 10
and
Page 34 - Item
3
)
. Plan the vent lengths so that a section joint
does not occur within the space defined by
ceiling joists or roof rafters. Refer to the Vent
Section Length Chart.
